#include<stdio.h>
#include<string.h>
int main()
{
    char arr1[] = "abc";
    char arr2[] = {'a','b','c','\0'};//\0为字符串结束标志
    printf("%d\n",strlen(arr1));//strlen--string length计算字符串长度的
    printf("%d\n",strlen(arr2));
    return 0;
}//字符串长度中\0的重要性